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/*
* Copyright 2021 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/sksl/ir/SkSLConstructorDiagonalMatrix.h"
#include "include/core/SkTypes.h"
#include "src/sksl/SkSLConstantFolder.h"
#include "src/sksl/ir/SkSLType.h"
namespace SkSL {
std::unique_ptr<Expression> ConstructorDiagonalMatrix::Make(const Context& context,
Position pos,
const Type& type,
std::unique_ptr<Expression> arg) {
SkASSERT(type.isMatrix());
SkASSERT(type.isAllowedInES2(context));
SkASSERT(arg->type().isScalar());
SkASSERT(arg->type().matches(type.componentType()));
// Look up the value of constant variables. This allows constant-expressions like `mat4(five)`
// to be replaced with `mat4(5.0)`.
arg = ConstantFolder::MakeConstantValueForVariable(pos, std::move(arg));
return std::make_unique<ConstructorDiagonalMatrix>(pos, type, std::move(arg));
}
std::optional<double> ConstructorDiagonalMatrix::getConstantValue(int n) const {
int rows = this->type().rows();
int row = n % rows;
int col = n / rows;
SkASSERT(col >= 0);
SkASSERT(row >= 0);
SkASSERT(col < this->type().columns());
SkASSERT(row < this->type().rows());
return (col == row) ? this->argument()->getConstantValue(0) : 0.0;
}
} // namespace SkSL
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